1 /* $NetBSD: src/lib/libc/citrus/citrus_mmap.c,v 1.3 2005/01/19 00:52:37 mycroft Exp $ */ 2 /* $DragonFly: src/lib/libc/citrus/citrus_mmap.c,v 1.2 2005/11/12 22:21:13 swildner Exp $ */ 3 4 /*- 5 * Copyright (c)2003 Citrus Project, 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/types.h> 31 #include <sys/mman.h> 32 #include <sys/stat.h> 33 #include <assert.h> 34 #include <errno.h> 35 #include <fcntl.h> 36 #include <limits.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include <unistd.h> 41 42 #include "citrus_namespace.h" 43 #include "citrus_region.h" 44 #include "citrus_mmap.h" 45 46 int 47 _citrus_map_file(struct _citrus_region * __restrict r, 48 const char * __restrict path) 49 { 50 int fd, ret = 0; 51 struct stat st; 52 void *head; 53 54 _DIAGASSERT(r != NULL); 55 56 _region_init(r, NULL, 0); 57 58 if ((fd = open(path, O_RDONLY)) == -1) 59 return errno; 60 if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1) { 61 ret = errno; 62 goto error; 63 } 64 65 if (fstat(fd, &st) == -1) { 66 ret = errno; 67 goto error; 68 } 69 if (!S_ISREG(st.st_mode)) { 70 ret = EOPNOTSUPP; 71 goto error; 72 } 73 74 head = mmap(NULL, (size_t)st.st_size, PROT_READ, MAP_FILE|MAP_PRIVATE, 75 fd, (off_t)0); 76 if (head == MAP_FAILED) { 77 ret = errno; 78 goto error; 79 } 80 _region_init(r, head, (size_t)st.st_size); 81 82 error: 83 close(fd); 84 return ret; 85 } 86 87 void 88 _citrus_unmap_file(struct _citrus_region *r) 89 { 90 _DIAGASSERT(r != NULL); 91 92 if (_region_head(r) != NULL) { 93 munmap(_region_head(r), _region_size(r)); 94 _region_init(r, NULL, 0); 95 } 96 } 97